2N/A/*
2N/A * CDDL HEADER START
2N/A *
2N/A * The contents of this file are subject to the terms of the
2N/A * Common Development and Distribution License (the "License").
2N/A * You may not use this file except in compliance with the License.
2N/A *
2N/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
2N/A * or http://www.opensolaris.org/os/licensing.
2N/A * See the License for the specific language governing permissions
2N/A * and limitations under the License.
2N/A *
2N/A * When distributing Covered Code, include this CDDL HEADER in each
2N/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
2N/A * If applicable, add the following below this CDDL HEADER, with the
2N/A * fields enclosed by brackets "[]" replaced with your own identifying
2N/A * information: Portions Copyright [yyyy] [name of copyright owner]
2N/A *
2N/A * CDDL HEADER END
2N/A */
2N/A
2N/A/*
2N/A * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
2N/A * Use is subject to license terms.
2N/A */
2N/A
2N/A/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
2N/A/* All Rights Reserved */
2N/A
2N/A#pragma ident "%Z%%M% %I% %E% SMI"
2N/A
2N/A#include "lint.h"
2N/A#include <sys/types.h>
2N/A#include <sys/ucontext.h>
2N/A#include <signal.h>
2N/A#include <errno.h>
2N/A
2N/Aint
2N/Asigstack(struct sigstack *nss, struct sigstack *oss)
2N/A{
2N/A struct sigaltstack nalt;
2N/A struct sigaltstack oalt;
2N/A struct sigaltstack *naltp;
2N/A
2N/A if (nss) {
2N/A /* Assumes stack growth is down */
2N/A nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ;
2N/A nalt.ss_size = SIGSTKSZ;
2N/A nalt.ss_flags = 0;
2N/A naltp = &nalt;
2N/A } else
2N/A naltp = (struct sigaltstack *)0;
2N/A
2N/A if (sigaltstack(naltp, &oalt) < 0)
2N/A return (-1);
2N/A
2N/A if (oss) {
2N/A /* Assumes stack growth is down */
2N/A oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size;
2N/A oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
2N/A }
2N/A return (0);
2N/A}